Home/ Supplements/ Quercetin/ C Extra 500 mg Plus 250 mg Bioflavonoids

C Extra 500 mg Plus 250 mg Bioflavonoids

product on market Capsule Natural Factors Safety: 100/100
100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 40% of ingredients have research evidence
A Label Compliance Grade

What the Evidence Says

AI-generated · Qwen 3.6 · methodology

Vitamin C and citrus bioflavonoids are supported by moderate evidence for supporting immune function and antioxidant activity. Rutin and hesperidin may further enhance the bioavailability of vitamin C and support vascular health. Overall, research coverage for this specific combination of botanical extracts is limited.

AI-generated summary based on research evidence. Not medical advice.

Label

Product Label

Label for C Extra 500 mg Plus 250 mg Bioflavonoids
Open Full PDF View on NIH DSLD →
Details

Label Data

1 Capsule(s)
Serving Size
Other Combinations
Product Type
40%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

Vitamin C
500 mg (830% DV)
Market median: 500.0mg (283 products) 174 studies (A:0, B:62)
50 mg
Market median: 500.0mg (19 products)
Rosehips
25 mg
Market median: 500.0mg (283 products) 174 studies (A:0, B:62)

Other Ingredients

Gelatin capsule Magnesium Stearate
Claims

Label Claims — Verification

Unverified Nutrient
Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

Suggested Usage: 1 capsule per day or as directed by a health professional.

Warnings & Precautions

Sealed for you protection. Do not use if seal is broken.

Keep out of reach of children.

Formulation Notes

Contains no artificial preservatives, color or sweeteners; no corn, dairy, starch, wheat or yeast.

Natural Factors C Extra contains 500 mg of Vitamin C in a blend of Citrus Bioflavonoids, Rutin, Rosehips and Hesperidin to optimize the body's use of Vitamin C.

Additional Information

PRODUCT OF CANADA

(recycle) Recyclable container

Purity & Potency Guaranteed

POTENT ANTIOXIDANT PROTECTION

R2

Bioflavonoids enhance the absorption of Vitamin C and act in synergy with Vitamin C to provide antioxidant protection, keep collagen healthy and help increase capillary strength. Vitamin C is a powerful antioxidant which supports healthy bones, cartilage, teeth and gums. It helps protect cells against environmental pollutants and deficiencies in the daily diet. All Natural Factors products are manufactured in accordance with the Government of Canada's Good Manufacturing Practices (GMP), among the highest standards in the world.

For freshness, store in a cool, dry place.

Metadata

Product Details

UPC / SKU0 68958 01321 3
DSLD Entry Date2012-04-26
Product TypeOther Combinations
FormCapsule
DSLD ID8178
Data Updated2026-04-11
Research

Research Evidence

184
Research Sources
55
Avg Quality
91
Systematic Review
75
Meta Analysis
7
Rct
7
Clinical Trial
2
Cochrane Review
1
Openfda Safety
B Treatment of gouty arthritis with traditional Chinese medicine decoction: Meta-analysis, network pharmacology analysis, and molecular docking
Meta Analysis Medicine 2024 PubMed DOI
B Effects of quercetin supplementation on lipid profile: A systematic review and meta-analysis of randomized controlled trials
Meta Analysis Critical reviews in food science and nutrition 2017 PubMed
B Dietary polyphenols and the risk of metabolic syndrome: a systematic review and meta-analysis
Meta Analysis BMC endocrine disorders 2024 PubMed DOI
B Quercetin and endurance exercise capacity: a systematic review and meta-analysis
Meta Analysis Medicine and science in sports and exercise 2011 PubMed DOI
B Dietary flavonoid intake and smoking-related cancer risk: a meta-analysis
Meta Analysis PloS one 2013 PubMed DOI
B Clinical efficacy evaluation and potential mechanism prediction on Guizhi-Shaoyao-Zhimu decoction in the treatment of gouty arthritis based on meta-analysis, network pharmacology analysis, and molecular docking
Meta Analysis Medicine 2023 PubMed DOI
B A Systematic Review: Quercetin-Secondary Metabolite of the Flavonol Class, with Multiple Health Benefits and Low Bioavailability
Systematic Review International journal of molecular sciences 2024 PubMed DOI
B Dietary flavonoid for preventing colorectal neoplasms.
Cochrane Review The Cochrane database of systematic reviews PubMed DOI
B Flavonoids for treating venous leg ulcers.
Cochrane Review The Cochrane database of systematic reviews PubMed DOI
B The effects of quercetin supplementation on lipid profiles and inflammatory markers among patients with metabolic syndrome and related disorders: A systematic review and meta-analysis of randomized controlled trials
Meta Analysis Critical reviews in food science and nutrition 2020 PubMed DOI
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This product page is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before taking any supplement.